Generator torque control methods

a technology of generator torque and control method, which is applied in the direction of motors, wind energy generation, dynamo-electric machines, etc., can solve the problems of generators that cannot the generator is unable to export power to the supply network, and the drive train of serious mechanical oscillations of wind turbines, etc., to achieve a rapid reduction of the dbr and the associated actuator or switchgear, the effect of significantly reducing the dbr
US8981584B2Active Publication Date: 2015-03-17GE ENERGY POWER CONVERSION TECH
5 Cites 4 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
GE ENERGY POWER CONVERSION TECH
Publication Date
2015-03-17

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

A wind turbine typically includes a generator and a rotating mechanical system having a natural period. The present invention relates to a method of controlling generator torque that minimizes oscillations in the speed of the generator rotor. In the event of a grid fault or transient, or a fault in the power converter, the generator torque is decreased at a substantially constant rate with respect to time. The rate at which the generator torque is decreases is proportional to the nominal rated torque of the generator and inversely proportional to an integer multiple of the natural period of the rotating mechanical system.
Need to check novelty before this filing date? Find Prior Art

Description

FIELD OF THE INVENTION

[0001] The present invention relates to generator torque control methods, and in particular to methods for controlling torque in the generator of a wind turbine during a fault condition.BACKGROUND OF THE INVENTION

[0002] It is possible to convert wind energy to electrical energy by using a wind turbine to drive the rotor of a generator, either directly or by means of a gearbox. The ac frequency that is developed at the stator terminals of the generator (the “stator voltage”) is directly proportional to the speed of rotation of the rotor. The voltage at the generator terminals also varies as a function of speed and, depending on the particular type of generator, on the flux level. For optimum energy capture, the speed of rotation of the output shaft of the wind turbine will vary according to the speed of the wind driving the turbine blades. To limit the energy capture at high wind speeds, the speed of rotation of the output shaft is controlled by altering the pitch...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More